<template>
  <div>
    <!-- 预览 -->
    <div class="model" v-show="model" @click="model = false">
      <div class="model-show">
        <img :src="modelSrc" alt="" />
      </div>
    </div>

    <div class="cut">
      <vue-cropper
        ref="cropper"
        :mode="option.mode"
        :img="option.img"
        :output-size="option.outputSize"
        :output-type="option.outputType"
        :info="option.info"
        :full="option.full"
        :fixed="option.fixed"
        :fixed-number="option.fixedNumber"
        :can-move="option.canMove"
        :can-move-box="option.canMoveBox"
        :fixed-box="option.fixedBox"
        :original="option.original"
        :auto-crop="option.autoCrop"
        :auto-crop-width="option.autoCropWidth"
        :auto-crop-height="option.autoCropHeight"
        :center-box="option.centerBox"
        :high="option.high"
        :max-img-size="option.maxImgSize"
        @real-time="realTime"
        @img-load="imgLoad"
        @crop-moving="cropMoving"
      ></vue-cropper>
    </div>

    <!-- 实时浏览 -->
    <div
      class="show-preview"
      :style="{ width: previews.w + 'px', height: previews.h + 'px', overflow: 'hidden', margin: '5px' }"
    >
      <div :style="previews.div">
        <img :src="previews.url" :style="previews.img" />
      </div>
    </div>

    <!-- 操作按钮 -->
    <div class="test-button">
      <label class="btn" for="uploads">upload</label>
      <input
        type="file"
        id="uploads"
        style="position: absolute; clip: rect(0 0 0 0)"
        accept="image/png, image/jpeg, image/gif, image/jpg"
        @change="uploadImg($event, 1)"
      />
      <button @click="startCrop" v-if="!crap" class="btn">start</button>
      <button @click="stopCrop" v-else class="btn">stop</button>
      <button @click="clearCrop" class="btn">clear</button>
      <button @click="refreshCrop" class="btn">refresh</button>
      <button @click="changeScale(1)" class="btn">+</button>
      <button @click="changeScale(-1)" class="btn">-</button>
      <button @click="rotateLeft" class="btn">rotateLeft</button>
      <button @click="rotateRight" class="btn">rotateRight</button>
      <button @click="finish('base64')" class="btn">preview(base64)</button>
      <button @click="finish('blob')" class="btn">preview(blob)</button>
      <a @click="down('base64')" class="btn">download(base64)</a>
      <a @click="down('blob')" class="btn">download(blob)</a>
      <a @click="() => (option.img = '')" class="btn">清除图片</a>
    </div>
  </div>
</template>

<script>
import { VueCropper } from 'vue-cropper';
// 裁剪生成图片的格式
const outputType = ['jpeg', 'png', 'webp']; // jpg (jpg 需要传入jpeg)
export default {
  name: 'Cropper',
  props: {
    title: {
      type: String,
      default: '裁剪图片'
    },
    visible: {
      require: true,
      type: Boolean,
      default: false
    }
  },
  components: {
    VueCropper
  },
  data() {
    return {
      localVisible: this.visible, //vueCropper组件裁剪配置信息

      model: false,
      modelSrc: '',
      crap: false,
      previews: {},
      option: {
        mode: 'cover', // 图片默认渲染方式 [contain , cover, 100px, 100% auto]
        img: 'https://avatars2.githubusercontent.com/u/15681693?s=460&v=4', // 裁剪图片的地址
        outputSize: 1, // 裁剪生成图片的质量
        outputType: 'png', // 裁剪生成图片的格式
        info: false, // 记录裁剪框的大小信息
        full: false, // 是否输出原图比例的截图
        canScale: true, // 图片是否允许滚轮缩放

        original: false, // 上传图片按照原始比例渲染
        canMove: false, // 上传图片是否可以移动
        canMoveBox: true, // 截图框能否拖动
        autoCrop: true, // 是否默认生成截图框
        // 只有自动截图开启 宽度高度才生效
        autoCropWidth: 750,
        autoCropHeight: 340,
        centerBox: true,
        high: true, // 是否按照设备的dpr 输出等比例图片
        maxImgSize: 2000, // 限制图片最大宽度和高度
        fixed: false, // 是否开启截图框宽高固定比例
        fixedBox: false, // 固定截图框大小 - 默认不允许改变
        fixedNumber: [16, 9] // 截图框的宽高比例
      },
      show: true
    };
  },
  computed: {
    dialogVisible: {
      get() {
        return this.localVisible;
      },
      set(val) {
        this.$emit('update:visible', val);
      }
    }
  },
  methods: {
    startCrop() {
      // start
      this.crap = true;
      this.$refs.cropper.startCrop();
    },
    stopCrop() {
      //  stop
      this.crap = false;
      this.$refs.cropper.stopCrop();
    },
    clearCrop() {
      // clear
      this.$refs.cropper.clearCrop();
    },
    refreshCrop() {
      // clear
      this.$refs.cropper.refresh();
    },
    changeScale(num) {
      num = num || 1;
      this.$refs.cropper.changeScale(num);
    },
    rotateLeft() {
      this.$refs.cropper.rotateLeft();
    },
    rotateRight() {
      this.$refs.cropper.rotateRight();
    },
    finish(type) {
      // 输出
      // var test = window.open('about:blank')
      // test.document.body.innerHTML = '图片生成中..'
      if (type === 'blob') {
        this.$refs.cropper.getCropBlob((data) => {
          console.log(data);
          var img = window.URL.createObjectURL(data);
          this.model = true;
          this.modelSrc = img;
        });
      } else {
        this.$refs.cropper.getCropData((data) => {
          this.model = true;
          this.modelSrc = data;
        });
      }
    },
    // 实时预览函数
    realTime(data) {
      // this.previews = data;
      // console.log(data);
    },

    down(type) {
      // event.preventDefault()
      var aLink = document.createElement('a');
      aLink.download = 'demo';
      // 输出
      if (type === 'blob') {
        this.$refs.cropper.getCropBlob((data) => {
          this.downImg = window.URL.createObjectURL(data);
          aLink.href = window.URL.createObjectURL(data);
          aLink.click();
        });
      } else {
        this.$refs.cropper.getCropData((data) => {
          this.downImg = data;
          aLink.href = data;
          aLink.click();
        });
      }
    },

    uploadImg(e, num) {
      //上传图片
      // this.option.img
      var file = e.target.files[0];
      if (!/\.(gif|jpg|jpeg|png|bmp|GIF|JPG|PNG)$/.test(e.target.value)) {
        alert('图片类型必须是.gif,jpeg,jpg,png,bmp中的一种');
        return false;
      }
      var reader = new FileReader();
      reader.onload = (e) => {
        let data;
        if (typeof e.target.result === 'object') {
          // 把Array Buffer转化为blob 如果是base64不需要
          data = window.URL.createObjectURL(new Blob([e.target.result]));
        } else {
          data = e.target.result;
        }
        if (num === 1) {
          this.option.img = data;
        } else if (num === 2) {
          this.example2.img = data;
        }
      };
      // 转化为base64
      // reader.readAsDataURL(file)
      // 转化为blob
      reader.readAsArrayBuffer(file);
    },
    imgLoad(msg) {
      console.log(msg);
    },
    cropMoving(data) {
      console.log(data, '截图框当前坐标');
    }
  }
};
</script>

<style lang="scss" scoped>
.cut {
  width: 500px;
  height: 500px;
  margin: 30px auto;
}

.c-item {
  max-width: 800px;
  margin: 10px auto;
  margin-top: 20px;
}

.content {
  margin: auto;
  max-width: 1200px;
  margin-bottom: 100px;
}

.test-button {
  display: flex;
  flex-wrap: wrap;
  align-content: center;
  justify-content: center;
}

.btn {
  display: inline-block;
  line-height: 1;
  white-space: nowrap;
  cursor: pointer;
  background: #fff;
  border: 1px solid #c0ccda;
  color: #1f2d3d;
  text-align: center;
  box-sizing: border-box;
  outline: none;
  margin: 20px 10px 0px 0px;
  padding: 9px 15px;
  font-size: 14px;
  border-radius: 4px;
  color: #fff;
  background-color: #50bfff;
  border-color: #50bfff;
  transition: all 0.2s ease;
  text-decoration: none;
  user-select: none;
}

.des {
  line-height: 30px;
}

code.language-html {
  padding: 10px 20px;
  margin: 10px 0px;
  display: block;
  background-color: #333;
  color: #fff;
  overflow-x: auto;
  font-family: Consolas, Monaco, Droid, Sans, Mono, Source, Code, Pro, Menlo, Lucida, Sans, Type, Writer, Ubuntu, Mono;
  border-radius: 5px;
  white-space: pre;
}

.show-info {
  margin-bottom: 50px;
}

.show-info h2 {
  line-height: 50px;
}

/*.title, .title:hover, .title-focus, .title:visited {
        color: black;
      }*/

.title {
  display: block;
  text-decoration: none;
  text-align: center;
  line-height: 1.5;
  margin: 20px 0px;
  background-image: -webkit-linear-gradient(
    left,
    #3498db,
    #f47920 10%,
    #d71345 20%,
    #f7acbc 30%,
    #ffd400 40%,
    #3498db 50%,
    #f47920 60%,
    #d71345 70%,
    #f7acbc 80%,
    #ffd400 90%,
    #3498db
  );
  color: transparent;
  -webkit-background-clip: text;
  background-size: 200% 100%;
  animation: slide 5s infinite linear;
  font-size: 40px;
}

.test {
  height: 500px;
}

.model {
  position: fixed;
  z-index: 10;
  width: 100vw;
  height: 100vh;
  overflow: auto;
  top: 0;
  left: 0;
  background: rgba(0, 0, 0, 0.8);
}

.model-show {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100vw;
  height: 100vh;
}

.model img {
  display: block;
  margin: auto;
  max-width: 80%;
  user-select: none;
  background-position: 0px 0px, 10px 10px;
  background-size: 20px 20px;
  background-image: linear-gradient(45deg, #eee 25%, transparent 25%, transparent 75%, #eee 75%, #eee 100%),
    linear-gradient(45deg, #eee 25%, white 25%, white 75%, #eee 75%, #eee 100%);
}

.c-item {
  display: block;
  user-select: none;
}

@keyframes slide {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: -100% 0;
  }
}
</style>
